They later moved to Birmingham, where Andi is said to have been persuaded by Masood to cover herself in a burqa.

She is also reported to have changed her name to an Arabic one.

But younger daughter Teegan resisted her father’s demands to give up her Western lifestyle.

The teenage beauty posed for the camera in a revealing backless dress at a prom night in May last year for soon-to-be graduates of Tunbridge Wells Girls’ Grammar School.

She had earlier come under pressure from her father to convert to Islam after she turned 16.

Her mother, Jane, managing director of a chemicals company, fought desperately to prevent her younger daughter from joining her father.

Luke Lawrence, 23, close friends with Andi at school when she lived in Northiam, East Sussex, with both her parents and sister, said: “Jane was totally against the idea and wanted Teegan to remain with her.

“But Andi was older and could be very headstrong, so she just went off and did it anyway.”

Luke said Andi was popular and attractive and he couldn’t understand why she had gone to live with her “nutter” dad.

Khalid Masood’s daughter Teegan HarveyFacebook

Masood had changed his name from Adrian Elms after converting to Islam while in prison awaiting trial for an alleged knife attack in 2003.

Luke said: “Andi was a lovely girl, but when she moved away to become a Muslim, she cut off contact with her friends here.

“She went off to live with her dad after he converted her. I’m not sure why she went with him, he was a nutter.

“Teegan stayed with her mum.”

Before converting to Islam and moving in with her dad, in 2008 Andi had been involved in a serious accident outside her house, which opens onto a fast road on the outskirts of Northiam.

Luke said: “She stepped out of the house with headphones on, without looking, and got hit by a van.

“She was seriously hurt and was in a wheelchair for a while. It left her traumatized and she was never quite the same afterwards.”

Khalid Masood spent hours by his daughter’s bedside in the hospital, praying for her to recover from her injuries, in twisted contrast to what he did nine years later at Westminster Bridge.